Low-torque wood tapping screw

Abstract

A low-torque wood tapping screw comprises a screw head, a screw rod arranged below the screw head, a conical tapping-in part arranged below the screw rod, a polished rod area arranged at the end, away from the conical tapping-in part, of the screw rod from top to bottom, and a threaded rod area arranged at the end, away from the conical tapping-in part, of the threaded rod. The first thread is continuously arranged on the screw rod and the conical tapping-in part, the second thread is arranged from the tail end, close to the conical tapping-in part, of the screw rod to the conical tapping-in part, and the third thread is arranged below the polished rod area and above the first thread. And the first screw thread is arranged below the third screw thread. The second threads and the first threads are arranged in a staggered mode. The included angle formed by the third thread and a straight line perpendicular to the central axis of the screw is larger than 60 degrees. According to the low-torque wood tapping screw, the second thread and the third thread are arranged, so that wood chips are prevented from blocking the low-torque wood tapping screw, the torque needed for tapping wood materials is reduced, and the wood materials are prevented from cracking.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a low-torque wood tapping screw. Background Art

[0002] Wood screws are used exclusively in wood materials or fiberboards. Wood screws have a plain rod, and the threads on the screw rod are special wood screw threads, which are different from the tooth angle and pitch of self-tapping screws and can be screwed directly into wooden components. Wood screws are used to fasten a metal part with a through hole to a wooden component. This connection is a detachable connection. The advantage of wood screws is that they have a stronger consolidation ability than nailing and are replaceable, with less damage to the wood surface, and are more convenient to use.

[0003] On the Chinese patent network, there is a kind of fast tapping wood screw and its precision thread plate mold with a publication number of CN217029566U. A fast tapping wood screw and its precision thread plate mold include a screw body and a screw head. The screw body includes a screw rod, a screw tip, a first thread, a second thread arranged adjacent to the first thread, and a notch. The first and second threads start from the screw tip and are spaced and arranged around each other on the screw rod, intersecting only at the beginning of the screw tip to form a double helix structure with intersecting starting points. The thread notch is an inverted triangular notch, and a plurality of the notches form a discharge groove arranged on the first and second threads along the screw rod. The fast tapping wood screw and its precision thread plate mold are arranged with a double helix structure and a discharge groove with intersecting starting points to facilitate fast tapping.

[0004] Although the rapid tapping screw and the precision thread plate mold thereof have a rapid tapping effect, the torque required is relatively large and the material is prone to cracking during operation. Utility Model Content

[0005] In view of this, the utility model provides a low-torque wood tapping screw that can solve the above problems.

[0006] The low-torque wood tapping screw comprises, from top to bottom, a screw rod, a conical tapping portion arranged below the screw rod, a first screw thread continuously arranged on the screw rod and the conical tapping portion, a second screw thread arranged from the end of the screw rod close to the conical tapping portion to the conical tapping portion, and a third screw thread arranged above the first screw thread. The first screw thread is arranged below the second screw thread, and the second screw thread is arranged alternately with the first screw thread.

[0007] Furthermore, the low-torque wood tapping screw also includes a screw head arranged above the screw rod, and a bare rod area arranged at one end of the screw rod away from the conical tapping portion.

[0008] Furthermore, the screw head includes a plurality of reinforcing ribs arranged on the side wall of the screw head, and a nail portion arranged on the screw head, and the shape of the screw head is a double countersunk shape.

[0009] Furthermore, the shape of the screw head is a double countersunk head shape.

[0010] Furthermore, the reinforcing ribs are equidistantly arranged on the side walls of the screw head.

[0011] Furthermore, the pitch of the second screw thread is greater than that of the first screw thread.

[0012] Furthermore, the outer diameter of the second screw thread is smaller than that of the first screw thread.

[0013] Furthermore, the angle formed by the third screw thread and a straight line perpendicular to the central axis of the screw is greater than 60 degrees.

[0014] Compared with the prior art, the utility model provides a low-torque wood tapping screw that reduces the torque required to tap into the wood material by setting the second screw thread and the third screw thread, while avoiding the cracking of the wood part caused by tapping. During the installation process, the low-torque wood tapping screw is placed in the wood area that needs to be tapped, and the low-torque wood tapping screw is screwed with a matching screwdriver aligned with the nail portion. The conical tapping portion and the first screw thread tap into the wood material, and the first screw thread leaves a thread groove on the wood material. The second screw thread and the first screw thread are staggered and cut to form a new screw thread groove to accommodate wood chips, so as to avoid wood chips blocking the first screw thread, thereby reducing the required torque. The pitch of the second screw thread is greater than that of the first screw thread, and the outer diameter of the second screw thread is smaller than that of the first screw thread, so as to reduce the resistance of the second screw thread tapping into the wood material and avoid affecting the tapping efficiency of the first screw thread. The angle formed by the third screw thread and the straight line perpendicular to the central axis of the screw rod is greater than 60 degrees, so that the third screw thread increases the hole expansion efficiency of the wood material, thereby reducing the required torque, and also prevents the bare rod area and the screw head from blocking the rotation and causing the wood material to crack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic structural diagram of a low-torque wood tapping screw.

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of a screw head having. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0018] like Figure 1 to Figure 2 As shown, it is a schematic diagram of the structure of a low-torque wood tapping screw provided by the utility model. The low-torque wood tapping screw includes a screw head 10, a screw rod 20 arranged below the screw head 10, and a conical attack portion 30 arranged below the screw rod 20, a bare rod area 40 arranged at one end of the screw rod 20 away from the conical attack portion 30, a first screw thread 50 continuously arranged on the screw rod 20 and the conical attack portion 30, a second screw thread 60 arranged from the end of the screw rod 20 close to the conical attack portion 30 to the conical attack portion 30, and a third screw thread 70 arranged above the first screw thread 50. It can be imagined that the low-torque wood tapping screw also includes some other functional modules, etc., which are technologies well known to those skilled in the art and will not be repeated here.

[0019] The screw head 10 is used to tighten or loosen the low-torque tapping screw in conjunction with a tool such as a screwdriver. The shape of the screw head 10 is a double countersunk head shape, that is, countersunk heads with different slopes are added to increase the anti-deformation force of the screw head 10 with different structural strengths. After the installation is completed, the screw head 10 sinks into the wood material, and the outer surface of the screw head 10 forms a flat plane with the outer surface of the wood material, so that the low-torque tapping screw is tightly combined with the wood material and is difficult to unscrew from the wood material. The screw head 10 includes a plurality of reinforcing ribs 11 arranged on the side wall of the screw head 10, and a nail portion 12 arranged on the screw head 10.

[0020] The reinforcing ribs 11 are arranged at equal intervals on the outer side wall of the screw head 10. The reinforcing ribs 11 are used to strengthen the structural strength of the screw head 10. When the low-torque wood tapping screw is tapped into a wood material, the torsion force applied to the screw head 10 is opposite to the resistance force transmitted from the conical tapping portion 30. Therefore, the reinforcing ribs 11 are arranged at equal intervals, so that the outer side wall of the screw head 10 is subjected to the same magnitude of anti-deformation force from different reinforcing ribs 11, thereby strengthening the force required for the deformation of the screw head 10, thereby preventing the screw head 10 from breaking due to strong deformation, and further strengthening the structural strength of the screw head 10.

[0021] The shape of the nail portion 12 is a hexagonal plum blossom with a column slot. In actual production, the hexagonal plum blossom with a column slot is used to indicate that the screw has the bare rod area 40. In actual operation, the contact area between the hexagonal plum blossom with a column slot of the same size and the screwdriver is larger than that of other shapes, so the hexagonal plum blossom with a column slot can withstand higher torque than the same size of a slotted or cross-slot screw, making the screw head 10 and its matching tools less likely to be damaged. It is conceivable that the nail portion 12 can adopt other shapes according to the actual application of the low-torque wood tapping screw.

[0022] The screw rod 20 is used to carry various functional components, and the screw rod 20 is used to relieve the rotational torque from the screw head 10 and the conical attacking portion 30 .

[0023] The conical attack portion 30 is conical in shape. The conical attack portion 30 is used to quickly attack unperforated wood materials. It is conceivable that the shape of the conical attack portion 30 changes according to actual application requirements.

[0024] The surface of the polished rod area 40 is smooth and has no screw thread. When the low-torque wood tapping screw is driven into a wood material, the polished rod area 40 acts as a buffer zone to slow down the torsional stress transmitted from the conical driving portion 30 to the screw head 10, thereby preventing the screw head 10 from breaking. When the wood material is not flat, the polished rod area 40 is used to fill the surface of the wood material.

[0025] The first screw thread 50 is used to tap into the wood material. The first screw threads 50 are arranged at equal intervals. When the low-torque wood tapping screw taps into the wood material, the first screw thread 50 assists the conical tapping portion 30 in tapping the wood material.

[0026] The second screw thread 60 is staggered with the first screw thread 50 so that the second screw thread 60 can cut a screw groove on the surface of the wood material that is different from the first screw thread 50. The screw groove is used to accommodate wood chips produced by the first screw thread 50 cutting on the wood material when the conical attack portion 30 attacks the wood material, so as to prevent the wood chips from blocking the gap of the first screw thread 50, thereby reducing the torque required for attacking the wood material and preventing the wood material from cracking. The pitch of the second screw thread 60 is greater than that of the first screw thread 50 to reduce the number of turns of the screw groove on the wood material, and the outer diameter of the second screw thread 60 is smaller than that of the first screw thread 50 to reduce the depth of the screw groove on the wood material, thereby reducing the resistance of the second screw thread 60 when attacking the wood material, and further reducing the impact on the first screw thread 50 attacking the wood material.

[0027] The third screw thread 70 is arranged in the polished rod area 40. The plurality of third screw threads 70 are used to enlarge the screw hole drilled by the conical attacking portion 30 and the first screw thread 50. The angle formed by the third screw thread 70 and the straight line perpendicular to the central axis of the screw rod 20 is greater than 60 degrees. When the low-torque wood tapping screw rotates, the contact area between the third screw thread 70 and the wood material is greater than that of the first screw thread 50, thereby increasing the enlargement effect of the third screw thread 70 on the screw hole, preventing the polished rod area 40 and the screw head 10 from being blocked by wood chips, thereby reducing the torque increased by the blockage of wood chips, and also reducing the possibility of cracking of the wood material caused by rotation.

[0028] Compared with the prior art, the low-torque wood tapping screw provided by the utility model reduces the torque required for tapping into the wood material by setting the second screw thread 60 and the third screw thread 70, and avoids the wood part from cracking due to tapping. During the installation process, the low-torque wood tapping screw is placed in the wood area to be tapped, and the low-torque wood tapping screw is screwed with a matching screwdriver aligned with the nail portion 12. The conical tapping portion 30 and the first screw thread 50 tap into the wood material, and the first screw thread 50 leaves a thread groove on the wood material. The second screw thread 60 and the first screw thread 50 are staggered and arranged on the wood material to cut and form a new screw thread groove to accommodate wood chips, so as to avoid wood chips blocking the first screw thread 50, thereby reducing the required torque. The pitch of the second screw thread 60 is greater than that of the first screw thread 50, and the outer diameter of the second screw thread 60 is smaller than that of the first screw thread 50, so as to reduce the resistance of the second screw thread 60 tapping into the wood material and avoid affecting the tapping efficiency of the first screw thread 50. The angle formed by the third screw thread 70 and the straight line perpendicular to the central axis of the screw rod 20 is greater than 60 degrees, so that the third screw thread 70 increases the hole expansion efficiency of the wood material, thereby reducing the required torque, and also prevents the bare rod area 40 and the screw head 10 from blocking the rotation and causing the wood material to crack.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. A low torque wood tapping screw, characterized in that: The low-torque tapping screw includes, from top to bottom, a screw rod, a conical tapping portion arranged below the screw rod, a first screw thread continuously arranged on the screw rod and the conical tapping portion, a second screw thread arranged from the end of the screw rod close to the conical tapping portion to the conical tapping portion, and a third screw thread arranged above the first screw thread, the first screw thread is arranged below the second screw thread, and the second screw thread is arranged alternately with the first screw thread.

2. The low torque wood tapping screw according to claim 1, characterized in that: The low-torque wood tapping screw also includes a screw head arranged above the screw rod and a polished rod area arranged at one end of the screw rod away from the conical tapping portion.

3. The low torque wood tapping screw according to claim 2, characterized in that: The screw head comprises a plurality of reinforcing ribs arranged on the side wall of the screw head, and a nail portion arranged on the screw head, and the shape of the screw head is a double countersunk shape.

4. The low torque wood tapping screw according to claim 2, characterized in that: The shape of the screw head is a double countersunk head shape.

5. The low torque wood tapping screw according to claim 3, characterized in that: The reinforcing ribs are arranged at equal distances on the side wall of the screw head.

6. The low torque wood tapping screw according to claim 1, characterized in that: The pitch of the second thread is greater than that of the first thread.

7. The low torque wood tapping screw according to claim 1, characterized in that: The outer diameter of the second thread is smaller than that of the first thread.

8. The low torque wood tapping screw according to claim 1, characterized in that: The angle formed by the third thread and a straight line perpendicular to the central axis of the screw is greater than 60 degrees.

Images